Not far from Seattle skyscrapers live 150-year-old clams, more than 250 species of fish, and underwater kelp forests as complex as any terrestrial ecosystem. For millennia, vibrant Coast Salish communities have lived beside these waters dense with nutrient-rich foods, with cultures intertwined through exchanges across the waterways. Transformed by settlement and resource extraction, Puget Sound and its future health now depend on a better understanding of the region's ecological complexities. Focusing on the area south of Port Townsend and between the Cascade and Olympic mountains, Williams uncovers human and natural histories in, on, and around the Sound. In conversations with archaeologists, biologists, and tribal authorities, Williams traces how generations of humans have interacted with such species as geoducks, salmon, orcas, rockfish, and herring. He sheds light on how warfare shaped development and how people have moved across this maritime highway, in canoes, the mosquito fleet, and today's ferry system. The book also takes an unflinching look at how the Sound's ecosystems have suffered from human behavior, including pollution, habitat destruction, and the effects of climate change.